Puzzles & Brain Teasers
The Square Field
Four brothers stand at each corner of their fathers square field.
At a given point the father signals for all of his sons to walk directly
to the next corner.
Brother A walks to where brother B was stood and this takes him eighty
minutes. Brother B walks to where brother C was stood and this takes him
eighty minutes.
Brother C walks to where brother D was stood and this also takes him eighty
minutes. Brother D walks to where brother A was stood but this takes him
one hour and twenty minutes!
Each son is as equally fit as the next. Each son walks at exactly the
same speed as the next and the field is completely flat, of solid ground
and no wind blows.

Why is this so ?
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